A six-wire three-phase motor that can realize both of increasing an output and reducing a torque ripple is provided. A six-wire three-phase motor is a six-wire three-phase motor including: a stator including a winding wire wound independently between phases; and a rotor including a plurality of magnets in a circumferential direction, wherein the stator or the rotor is configured in such a manner that a third harmonic current component in a motor current of when an overmodulation voltage based on a PWM signal is applied becomes higher than a third harmonic current component in a motor current of when a sinusoidal modulation voltage based on the PWM signal is applied.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A six-wire three-phase motor comprising: a stator including a winding wire wound independently between phases; and a rotor including a plurality of magnets in a circumferential direction, wherein the stator or the rotor is configured in such a manner that a third harmonic current component in a motor current of when an overmodulation voltage based on a PWM signal is applied becomes higher than a third harmonic current component in a motor current of when a sinusoidal modulation voltage based on the PWM signal is applied, and wherein the winding wire is arranged in the stator with a pitch of ⅔ of a magnetic pole pitch.
2. The six-wire three-phase motor according to claim 1 , wherein an induced voltage generated in the winding wire due to the magnets includes no third harmonic component.
3. The six-wire three-phase motor according to claim 2 , wherein the winding wire is arranged in the stator such that no third harmonic component is included in the induced voltage generated due to the magnets.
4. The six-wire three-phase motor according to claim 3 , wherein the stator is a two-pole three-slot concentrated winding stator or four-pole three-slot concentrated winding stator.
5. The six-wire three-phase motor according to claim 2 , wherein a pole-arc ratio of the magnets is ⅔.
6. An inverter device that applies an inverter applied voltage by PWM control based on a carrier wave and a signal wave to the six-wire three-phase motor according to claim 1 , wherein the signal wave includes a fundamental wave having amplitude higher than amplitude of the carrier wave and a third harmonic signal and has amplitude equal to or lower than the amplitude of the carrier wave.
7. A motor system comprising: the six-wire three-phase motor according to claim 1 ; and an inverter device that applies an inverter applied voltage by PWM control based on a carrier wave and a signal wave to the six-wire three-phase motor, wherein the signal wave includes a fundamental wave having amplitude higher than amplitude of the carrier wave and a third harmonic signal and has amplitude equal to or lower than the amplitude of the carrier wave.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
June 19, 2017
December 15, 2020
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